Abstract
Multifrequency observations in the equatorial electrojet have shown that type 1 irregularities can be detected until frequencies as low as 4.6 MHz. Their phase velocity is equal to a threshold value which is influenced by the primary gradient in the E layer. During daytime the gradient is destabilizing and the threshold velocity is less than the ion acoustic velocity. Type 1 irregularities are then present for lower drift velocities and theories of plasma instabilities in the equatorial electrojet have to be reexamined at the light of these measurements.
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